The pataca of Malta was a large copper coin minted during the 16th century and 17th century as fiduciary coin. This coin was first minted during the reign of Grand Master Fra Jean de Valette just after the Siege of Malta 1565. The last minting dates the reign of Grandmaster Fra Jean de Lascaris. The inscription on the coin was the following: "Not Money but Trust".
References
Maltese pataca Wikipedia(Text) CC BY-SA